Special Functions; V-Time Key; R-Dar-Pi-Dd / R (T) Key - Chauvin Arnoux C.A 6545 Manual De Instrucciones

4.1 Key
2nd
This key is used to select the secondary function of the function keys. It is always related to the
This symbol disappears as soon as the selected function key is pressed, unless the
In this case, it disappears only if the
used to rapidly decrement the parameters using the
4.2

V-TIME key /

V-TIME Primary function
This key gives a read-out of all available secondary information on the small display, both during and
after measurement.
In the insulation measurement function:
- Time elapsed since the beginning of the measurement
- Voltage between terminals + and – of the unit
- Date, time, test voltage and OBJ: TEST in memory recall mode (MR) (C.A 6547)
Secondary function
- The small display shows the time of the programmed measurement in the SET-UP, the symbol is ON.
Pressing the START key starts the measurement.
- By default, the measurement lasts 30 minutes, but this value can be changed in the SET-UP menu.
- As soon as the measurement has started, the small display decrements the remaining time.
When this time reaches zero, measurement stops.
During the running of a programmed-time test, intermediate samples (resistance/voltage values as a
function of time) are automatically memorised.
The time between each sample is 30 s by default, but this value may be changed in the SET-UP menu.
The samples may be displayed using the R (t) function (see § 4.3) as long as a new measurement has
not been launched. They are erased at each new measurement.
They are automatically memorised with the final value of the resistance when using the MEM function
(memorisation) (C.A 6547).
If the position of the rotary switch is modified, or if the STOP key is pressed during the measurement,
the measurement is stopped.
4.3

R-DAR-PI-DD / R (t) key

R-DAR-PI-DD Primary function
The R-DAR-PI-DD key is used to calculate automatically the Polarisation Index (PI) and the Dielectric
Absorption Ratio (DAR) or perform a Dielectric Discharge test (DD).
These PI and DAR values are particularly interesting for monitoring the ageing of the insulation of
rotating machines or very long cables, for example.
On this type of component, the measurement is disturbed at the beginning by parasite current flows
(capacitive load current, dielectric absorption current) which progressively cancel each other out.
To measure exactly the representative leak current of the insulation, it is therefore necessary to
perform long duration measurements, to by-pass the parasite currents present at the beginning of
measurements.

4. SPECIAL FUNCTIONS

key is pressed again or if other function keys are pressed. This is
2nd
key without having to press the
(Programmed-time test)
42
symbol.
2nd
key is activated.
key each time.
2nd